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Accounts Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accounts receivable, gross $ 203,607   $ 372,440      
Allowance for doubtful accounts (2,093)   (1,259)      
Total accounts receivable, net 201,514   371,181      
Cumulative-effect adjustment to retained earnings (accumulated deficit) (589,911) $ (499,172) 3,837,081 $ 3,866,458 $ 3,811,135 $ 3,918,880
Retained Earnings (Accumulated Deficit)            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Cumulative-effect adjustment to retained earnings (accumulated deficit) (3,849,768) $ (3,756,825) 554,446 $ 610,564 $ 567,807 $ 682,689
Cumulative effect adjustment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Cumulative-effect adjustment to retained earnings (accumulated deficit)     (410)      
Cumulative effect adjustment | Retained Earnings (Accumulated Deficit)            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Cumulative-effect adjustment to retained earnings (accumulated deficit)     (410)      
Cumulative effect adjustment | Retained Earnings (Accumulated Deficit) | ASU 2016-13            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Cumulative-effect adjustment to retained earnings (accumulated deficit)     (400)      
Trade accounts            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accounts receivable, gross 125,147   276,629      
Joint interest accounts            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accounts receivable, gross 65,222   82,112      
Other accounts            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accounts receivable, gross $ 13,238   $ 13,699